In c++

Write a function

vector diamondsequence(vector> &m)

where

m is the NxN matrix with odd N>2 and returns the diamond sequence if m is an NxN matrix with odd N>2,

otherwise returns the empty sequence.

File you must submit: soln_func.cc

Examples:

a) 1 2 3 4 5 11 12 13 14 15 6 7 8 9 10 21 22 23 24 25 16 17 18 19 20 3 14 10 24 18 22 6 12

b) 1 2 4 5 6 7 9 10 21 22 24 25 16 17 19 20 

c) 1 2 3 4 5 6